Syringe device



Patented July 31, 1945 Y oEFlcE sYmNGE DEVICE Arthur lasmlth, Los Angeles, oeuf. Application li'ay 27, 1944, serial No. 537,595

1 Claim.

This invention relates to a syringe device.

The general object of the invention is :to provide an improved ampule type hypodermic syringe which is adapted for producing local anaesthesia.

Another object of the invention is to provide an improved means for causing mixture of a drug and vehicle in preparing fresh solutions for in- J'ection.

A further object of the invention is to provide a novel needle construction for use in a hypodermic syringe.

Other objects and the advantages of my invention will be apparent from the following description taken in connection with the accompanying drawing, wherein:

Fig. 1 is a central sectional view showing my invention;

Fig. 2 is a fragmentary central sectional view through anampule adapted to be used with my invention, and

Fig. 3 is an enlarged fragmentary sectional view showing the forward end of the syringe and ampule.

Referring to the drawing by reference characters, I have shown my invention as embodied in a syringe which is indicated at I0. As shown the syringe includes a barrel II having a front member I2 and a. rear member I3. The front member includes a tube or needle receiving bore I4 and has a forwardly extending threaded portion I5 with the extreme end having a rounded recess I6.

'I'he rear member I3 is threaded to the barrel as at I1 and includes a telescoping portion' I8 which has a flanged head I9 thereon. A spring 20 engages the head and the inner portion of the cap, thus tending to separate the head from the cap. Apllmgerrod 2I is slidable through the cap and is provided at its lower end with a flange 22. l

An ampule is indicated generally at 24 and as shown comprises a cylindrical glass tube which at its rear end is provided with a piston cork 25 which has an endv 21 engaged by the plunger ilange 22 and an internal enlarged recess 28 opening into the ampule.

At the front end the ampule is provided with a cork, indicated generally at 29, which includes an end wall 30 having an integral skirt 3l' providing a recess 32 which opens inwardly. 'f

The recess 32 provides a chamber for a medicinal tablet 33 which, when in place in the chamler. is hermetically sealed from the uid and vehicular contents 36 of the ampule by a disc 31 (Cl. 12S-218.1)

which engages the inner wall of the skirt 3|. The disc-31 is held normally in fluid tight position by the resiliency of the material of the cork but can be displaced, as will be later described. The corks 25 and 29 and the disc 31 may be made of rubber or other suitable resilient material.

The threaded portion I5 is adapted to be engaged by a tip member 38 which has an internally threaded recess 39 4and which has an arcuate recess 40. The tip 38 has a central aperture 4I vwhich is adapted to receive a hypodermic needle 42 which at its upper end is provided with a ball 43 which iits in the recesses I6 and 40. The ball 43 may be made of soft material such as lead. The upper end of the needle 42 is received in the lower end of a tube 44. The tube 44 and needle 42 are held in position by the ball 43 as shown. The inner end of the tube is closed as at 45 and the side wall of the tube is provided with a plurality of apertures 46 which afford communication from the exterior of the tube to the interior of the tube, whence uid passes into the needle 42 for injection. The end wall 30 of the cork has a central recess 30.

In use the ampule is placed in the barrel as shown in Fig. 1, whereupon the removable needle 42 is placed in the tip 38 and is moved to the position shown in Fig. 1. The tube 44 is then moved into the bore I4 and enters the recess 30'. The end 45 of the tube ruptures the end wall portion 30 with the recess 30' and the tip enters the cork 29. As the tip 38 is screwed into place the end 45 of the tube impinges upon the disc 31 and forces the disc out of the recess 32 as shown in Fig. 3 so that the medicinal tablet may be dissolved by the vehicle. The syringe is then ready for use.

Having thus described my invention, I claim:

A hypodermic syringe including a barrel having a rear member, a plunger slidable in the rear member, said barrel havinga front closure member at its front end, said barrel adapted to receive without opening. and retain an ampule seated in said barrel, said ampule having a plston cork in its rear end engageable by said plunger and a second cork in its front end, said ampule containing a uid between said corks, said second cork having an inwardly opening recess and having a piercable diaphragm portion forming the outer wall of said recess, a forceable disc in said second cork and spaced from said diaphragm, a medicinal pellet in said second cork recess, said front closure member having a threaded portion, a removable tip having a threaded portion adapted to engage the threaded portion ol'said front closure member, said tip having a bore therem through, a needle arranged in said bore, an en* larged tubular member mounted on the inner end of said `needle and communicating therewith and a. sea-ling ball mounted upon said needle and said tubular member at their `junction and sealing the same, said tip 'having .a curved portion adjacent its upper end, the lower portion of said ball restlng within said curved portion, :said front member having a curved recess, and a bore adapted l0 

